﻿using InquiroManagerApp.Common;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

using OrandoLabs.Inquiro;
using OrandoLabs.InquiroManager;
using System.Threading.Tasks;

// The Grid App template is documented at http://go.microsoft.com/fwlink/?LinkId=234226

namespace InquiroManagerApp
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        InquiroManager Manager;
        /// <summary>
        /// Initializes the singleton Application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        protected override async void OnLaunched(LaunchActivatedEventArgs args)
        {
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();
                //Associate the frame with a SuspensionManager key                                
                SuspensionManager.RegisterFrame(rootFrame, "AppFrame");

                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    // Restore the saved session state only when appropriate
                    try
                    {
                        await SuspensionManager.RestoreAsync();
                    }
                    catch (SuspensionManagerException)
                    {
                        //Something went wrong restoring state.
                        //Assume there is no state and continue
                    }
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }
            if (rootFrame.Content == null)
            {
                // When the navigation stack isn't restored navigate to the first page,
                // configuring the new page by passing required information as a navigation
                // parameter
                if (!rootFrame.Navigate(typeof(GroupedItemsPage), "AllGroups"))
                {
                    throw new Exception("Failed to create initial page");
                }
            }

            if (Manager == null)
            {
                var appData = Windows.Storage.ApplicationData.Current;
                var path = await appData.LocalFolder.CreateFolderAsync("test-manager", Windows.Storage.CreationCollisionOption.OpenIfExists);
                var baseDir = path.Path;
                Manager = await InquiroManager.CreateInquiroManager("testmanager", baseDir);

                string[] pages = new string[] {
                    "http://www.google.com",
                    "http://www.facebook.com",
                    "http://www.microsoft.com",
                    "http://www.apple.com"
                };
                string[] names = new string[] {
                    "google",
                    "facebook",
                    "microsoft",
                    "apple"
                };
                string testurl = pages[0];
                DocumentObject doc;
                if (!Manager.O.DocumentsByUrl.TryGetValue(testurl, out doc))
                {
                    for (int i = 0;i < pages.Length; i++)
                        await AddHtmlPage(pages[i], names[i]);
                }
                Term term0 = new TextTerm("apps", new Target(0), 0);
                Term term1 = new TextTerm("and", new Target(0), 0);
                Term term2 = new TextTerm("games", new Target(0), 0);
                List<Term> phrases = await FindPhrases(new Term[] { term0, term1, term2 });
                int count = phrases.Count;
            }
            // Ensure the current window is active
            Window.Current.Activate();
        }

        private async Task<DocumentObject> AddHtmlPage(string url, string friendlyName)
        {
            DocumentObject doc = await Manager.AddHtmlDocument(url, friendlyName);
            return doc;
        }

        private async Task<List<Term>> FindPhrases(Term[] phrase)
        {
            return await Task<List<Term>>.Run(() =>
                {
                    List<Term> terms = new List<Term>();
                    using (InquiroContext ctx = new InquiroContext(Manager.IDb, Manager.IContextName))
                    {
                        var result = ctx.FindPhrases(phrase, 0, 100);
                        foreach (var tuple in result)
                        {
                            PhraseIndex idx = tuple.Item1;
                            terms.Add(idx.Term);
                        }
                    }
                    return terms;
                }
            );
        }

        private async Task<bool> TerminateManagerAsync()
        {
            return await Task<bool>.Run(() =>
                {
                    Manager.Dispose();
                    Manager = null;
                    return true;
                }
            );
        }

        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private async void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            await SuspensionManager.SaveAsync();
            await TerminateManagerAsync();
            deferral.Complete();
        }
    }
}
